WO2013077117A1

WO2013077117A1 - Resolver holder, motor unit, and method for manufacturing motor unit

Info

Publication number: WO2013077117A1
Application number: PCT/JP2012/076777
Authority: WO
Inventors: 福井健太郎; 佐藤博之
Original assignee: 本田技研工業株式会社
Priority date: 2011-11-22
Filing date: 2012-10-17
Publication date: 2013-05-30

Abstract

Provided are a resolver holder, a motor unit, and a method for manufacturing a motor unit, whereby the precision of a resolver can be enhanced and/or the space requirements of the resolver can be reduced. In a resolver holder (56), a motor unit (16), and a method for manufacturing a motor unit, the shape of the resolver holder (56) is configured so that the magnetic reluctance of the leakage flux of each phase from a motor stator (42) and/or a motor rotor (40) is uniform.

Description

Resolver holder, motor unit, and method of manufacturing motor unit

The present invention relates to a resolver holder or resolver holder for holding a resolver rotor for detecting a rotation angle of a motor, a motor unit having the resolver holder, and a method for manufacturing the motor unit.

Techniques for reducing the influence of magnetic flux leakage from the motor to the resolver have been proposed {JP 2010-154710 A (hereinafter referred to as “JP という 2010-154710 A”), JP 2001-231218 (hereinafter referred to as “JP”). “JP 2001-231218 A”) and JP-A-2002-233109 (hereinafter referred to as “JP 2002-233109 A”)}.

JP ―2010-154710 A aims to reduce the influence of the resolver on magnetic flux leaking from the motor body in the motor with resolver (summary). In order to solve this problem, the motor 10 with a resolver of JP１５2010-154710 A is disposed on the motor rotor 22 side at a predetermined interval from the resolver 16 and has a retainer 34 that induces a magnetic flux leaking from the motor body 14 ( wrap up). The retainer 34 prevents leakage magnetic flux from entering the resolver 16 (summary).

JP ２３2001-231218 A is to provide a rotating electrical machine that can prevent the influence of leakage magnetic flux generated between the armature winding and the rotor on the resolver rotation detector and that the resolver rotation detector can be easily attached and detached. (Summary). In order to solve this problem, in JP 2001-231218 A, the resolver rotation detector 9 is disposed outside the bearing 4 that rotatably supports the output shaft 1 and the end bracket 6 that holds the bearing 4, and the end bracket 6 is configured such that the leakage flux 11 does not affect the resolver rotation detector 9 (summary). That is, the resolver rotation detector 9 is magnetically separated from the rotor 3 and the stator 8 by the end bracket 6 (and the partition and the non-output side bearing 4b formed integrally with the end bracket 6). Is prevented from entering the leakage magnetic flux 11 ([0028]).

JP ―2002-233109 A aims to provide a vehicle motor that can be easily assembled while improving the detection accuracy of the rotational position of the motor by a resolver (summary). In order to solve this problem, JP 2002-233109 A includes a rotor 3, a stator core 32 disposed opposite to the rotor 3, and a stator 2 including a stator winding 33 provided on the stator core 32. And a resolver 1S having a resolver rotor 103 interlocked with the rotor 3 and a resolver stator 102 disposed opposite to the resolver rotor 103, and a frame 4 supporting the rotor 3 and the stator 2. In the electric motor 1, the resolver 1 </ b> S is provided at the axial end 4 br of the frame 4 and is arranged at a predetermined interval from the rotor 3 and the stator 2 (summary). That is, by separating the resolver 1S from the rotor 3 and the stator 2, leakage magnetic flux can be prevented from entering the resolver 1S ([0007]).

Incidentally, a hybrid vehicle including both an engine and a motor has been developed as a vehicle drive source {Japanese Patent Laid-Open No. 2006-152882 (hereinafter referred to as “JP2006-152882 A”)}.

The technologies in JP 2010-154710 A, JP 2001-231218 A, and JP 2002-233109 A still have room for improvement in terms of improving the accuracy of the resolver. In addition, as described above, JP 2010-154710ＪA, JP 2001-231218 A, and JP 2002-233109 A are intended to reduce the influence of leakage magnetic flux from the motor to the resolver. This is a technique based on the idea of preventing leakage magnetic flux from entering the resolver, and requires additional parts or additional space.

However, for example, in the case of a hybrid vehicle, there is little room for securing an additional space because two drive sources of an engine and a motor are mounted on the vehicle, and there is a demand for space saving for the resolver. Further, the space-saving requirement for the resolver is not limited to hybrid vehicles, but is common to all devices or devices using other vehicles and motors.

The present invention has been made in view of such problems, and provides a resolver holder, a motor unit, and a method for manufacturing the motor unit that can realize at least one of improvement in accuracy and space saving of the resolver. With the goal.

A resolver holder according to the present invention holds a resolver stator or resolver rotor of a resolver that detects a rotation angle of a motor, and the shape of the resolver holder is set to leak from at least one of a motor stator and a motor rotor. The magnetic resistance against the magnetic flux is configured to be uniform.

According to this invention, the shape of the resolver holder is configured such that the magnetic resistance against the leakage magnetic flux of each phase from at least one of the motor stator or the motor rotor is equal. Thereby, since the leakage magnetic flux from each phase cancels out, the influence of the leakage magnetic flux from the motor to the resolver can be suppressed, and the accuracy of the resolver can be improved. Further, since the leakage magnetic flux from each phase is canceled out, the influence of the leakage magnetic flux can be suppressed even when the leakage magnetic flux from each phase is relatively strong. Therefore, the distance between the motor and the resolver can be made relatively short, and space saving can be realized.

The resolver holder includes an annular part for attaching the resolver stator or the resolver rotor, and a plurality of projecting parts projecting radially outward or radially inward from the annular part, and an external attachment part for attaching the resolver holder On the other hand, it may be attached via the plurality of protrusions.

The number of the plurality of protrusions is the same as or a multiple of the phase number of the motor, each of the plurality of protrusions has the same shape or a different shape, and the plurality of protrusions are in each phase of the motor. The same number is allocated, and the arrangement of the protrusions in each phase may be equal. Thereby, when each of the plurality of projecting portions has the same shape, it is possible to design a configuration in which the magnetic resistance to the leakage magnetic flux of each phase is uniform relatively easily. In addition, when each of the plurality of projecting portions has a different shape, the resolver holder can be easily shaped according to the shape of the mounting portion.

Alternatively, the number of the plurality of protrusions may be different from the number of phases of the motor and a multiple thereof.

The motor unit according to the present invention includes the resolver holder and the external mounting portion, and at least one of a convex portion and a concave portion is provided on the mounting surface to which the protruding portion is mounted among the external mounting portions. The plurality of projecting portions are formed and attached to the mounting surface at positions other than the convex portions and the concave portions. Thereby, even if a convex part or a recessed part exists in an attachment surface, it becomes possible to arrange | position a resolver holder avoiding the said convex part and recessed part. Therefore, it becomes easy to avoid an increase in size due to the presence of the resolver holder.

A motor unit according to the present invention includes a motor and a resolver that detects a rotation angle of the motor, and the resolver includes a resolver stator or a resolver holder that holds a resolver rotor, and the motor stator of the motor In addition, the resolver holder is arranged so that the magnetic resistance against the leakage magnetic flux from each phase in at least one of the motor rotor is equal.

A method of manufacturing a motor unit according to the present invention is a method of manufacturing a motor unit that includes a motor and a resolver that detects a rotation angle of the motor, and the resolver includes a resolver holder that holds a resolver stator or a resolver rotor. The resolver holder has an annular part to which the resolver stator or the resolver rotor is attached, and a plurality of projecting parts projecting radially outward from the annular part, and the resolver holder is provided from at least one of the motor stator and the motor rotor. The resolver holder is arranged so that the magnetic resistance against the leakage magnetic flux of each phase is uniform.

It is the perspective view which showed simply the external appearance of the drive force production | generation part which comprises the electric vehicle carrying the motor unit which concerns on one Embodiment of this invention. It is a perspective view which shows a mode that a resolver stator is attached to a 2nd resolver holder. It is a figure for demonstrating the leakage magnetic flux which generate | occur | produces with respect to the said resolver stator from a motor stator. It is a figure which shows the positional relationship of the motor and resolver which concern on the said embodiment. It is the figure seen in the direction of the output shaft of the said motor toward the engine side from the said motor side. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a sectional view taken along line VII-VII in FIG. 5. FIG. 6 is a sectional view taken along line VIII-VIII in FIG. 5. It is a figure which shows the positional relationship of the motor and resolver of the motor unit which concerns on a comparative example. It is a figure for demonstrating the example of the leakage magnetic flux from the motor in the said embodiment and the said comparative example to a resolver. It is a figure which shows the positional relationship of the motor and resolver of the motor unit which concerns on the 1st modification of this invention. It is a figure which shows the positional relationship of the motor and resolver of the motor unit which concerns on the 2nd modification of this invention.

A. Embodiment 1 FIG. Explanation of overall configuration [1-1. overall structure]
FIG. 1 is a perspective view schematically showing the external appearance of a driving force generation unit 12 constituting an electric vehicle 10 (hereinafter also referred to as “vehicle 10”) equipped with a motor unit 16 according to an embodiment of the present invention. is there. The vehicle 10 is a so-called hybrid vehicle, and the driving force generation unit 12 includes an engine 14 and a motor unit 16 as driving sources. The motor unit 16 includes a motor 18 and a resolver 20. As will be described later, the vehicle 10 may be a vehicle other than a hybrid vehicle as long as it has a motor 18 and a resolver 20.

[1-2. Engine 14]
The engine 14 is a main driving source for generating the driving force F [N] (or torque [N · m]) of the vehicle 10. Insert holes (not shown) for inserting positioning pins as jigs when the engine 14 is assembled to a vehicle body (not shown) on both sides of the engine block 32 (external mounting portion) of the engine 14. Is formed on the bottom surface side of the engine 14. Along with the formation of the insertion hole, a plurality of convex portions 34 (ribs) are formed on both side surfaces of the engine block 32.

[1-3. Motor unit 16]
(1-3-1. Motor 18)
The motor 18 is a secondary driving source for generating the driving force F of the vehicle 10. The motor 18 is a three-phase AC brushless type, and generates a driving force F of the vehicle 10 based on electric power supplied from a battery (not shown) via an inverter (not shown). Further, the motor 18 charges the battery by outputting electric power (regenerative power Preg) [W] generated by performing regeneration to the battery. The regenerative power Preg may be output to a 12 volt system or an auxiliary machine (not shown).

As shown in FIG. 1, the motor 18 includes a motor rotor 40, a motor stator 42, and an output shaft portion 44 (FIG. 4). As the motor 18, for example, a motor similar to that described in JP2006-152882 A can be used.

(1-3-2. Resolver 20)
The resolver 20 detects a rotation angle of the motor 18 and includes a resolver rotor 50, a first resolver holder 52, a resolver stator 54, and a second resolver holder 56 (hereinafter also referred to as “resolver holder 56”). The resolver rotor 50 is attached to the output shaft portion 44 of the motor 18 and rotates together with the motor rotor 40.

FIG. 2 is a perspective view showing how the resolver stator 54 is attached to the second resolver holder 56. As shown in FIG. 2, the resolver stator 54 is press-fitted into the resolver holder 56 in the direction of the arrow X1 in FIG.

The resolver stator 54 includes an annular portion 60 made of a magnetic material (hereinafter referred to as “stator annular portion 60”), and a plurality of resolver coils formed integrally with the stator annular portion 60 and projecting radially inward from the stator annular portion 60. It has a winding part 62 and a plurality of resolver coils 64 wound around the resolver coil winding part 62.

The resolver holder 56 is for fixing the resolver stator 54 to the engine block 32, and is made of a metallic {for example, iron (particularly, cold rolled steel plate)} annular portion 70 (hereinafter referred to as "holder annular portion 70"). )) And a plurality of bolt fastening portions 72a to 72c (hereinafter, referred to as “fastening portions 72a to 72c”) that are integrally formed with the holder annular portion 70 and project radially outward from the holder annular portion 70. Are collectively referred to as “.”. The resolver holder 56 is fixed to the engine block 32 by fastening bolts 78 (FIG. 1) at fastening portions 72a to 72c as projecting portions.

As shown in FIG. 1 and the like, there are three bolt fastening portions 72a to 72c of the present embodiment having the same shape (more specific configuration and arrangement of the fastening portion 72 will be described later).

Note that, as described above, the engine block 32 also functions as an attachment portion of the second resolver holder 56. It should be noted that the shape of the second resolver holder 56 in FIG. 2 is simplified, and the cross section in the radial direction is a shape as shown in FIGS.

2. Configuration for Canceling Leakage Magnetic Flux In the motor unit 16 according to the present embodiment, the resolver holder 56 has the above-described configuration, so that the influence of the leakage magnetic flux Φ generated from the motor stator 42 can be reduced. .

[2-1. Generation of leakage flux Φ]
FIG. 3 is a diagram for explaining the leakage magnetic flux Φ generated from the motor stator 42 to the resolver stator 54. In FIG. 3, Ax indicates an output shaft (axis line) of the motor 18. As shown in FIG. 3, when the motor 18 operates, the leakage flux Φ from the motor stator 42 enters the resolver stator 54. In the resolver stator 54, the leakage magnetic flux Φ is also generated from the motor rotor 40. However, in the present embodiment, the value is small, and the description is omitted in FIG.

[2-2. Configuration to reduce the effect of leakage flux Φ]
In this embodiment, rather than preventing the leakage flux Φ from entering the resolver 20, the problem of the leakage flux Φ is addressed by the idea of reducing the influence even if the leakage flux Φ enters.

FIG. 4 is a diagram showing a positional relationship between the motor 18 and the resolver 20 according to the present embodiment. FIG. 4 is a view seen from the engine 14 side toward the motor 18 side. In other words, FIG. 4 is a view seen from the direction of the output shaft Ax of the motor 18 (a view seen in the direction of the arrow X1 in FIG. 1).

4, “U”, “V”, and “W” indicate the U phase, V phase, and W phase of the motor 18, respectively. Therefore, in the resolver holder 56 of the present embodiment, the first fastening portion 72a among the three fastening portions 72a to 72c is disposed between the U-phase and W-phase motor coils 80, and the second fastening portion 72b is The third fastening portion 72 c is disposed between the V-phase and W-phase motor coils 80. In FIG. 4, “U”, “V”, and “W” are not shown for all phases, but the combination of U, V, and W is repeated clockwise in FIG. Moreover, as above-mentioned, each fastening part 72 is the same shape.

By configuring and arranging the fastening portions 72a to 72c as described above, the magnetic resistance Rm with respect to the leakage magnetic flux Φ entering the resolver stator 54 from the motor stator 42 becomes equal in each phase. For this reason, the leakage magnetic flux Φ from each phase cancels out, and the error of the resolver 20 can be suppressed.

3. FIG. 5 is a view as seen in the direction of the output shaft Ax of the motor 18 from the engine 14 side toward the motor 18 side (a view seen in the direction of the arrow X2 in FIG. 1). It is. 6 is a cross-sectional view taken along line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

As described above, in the resolver holder 56 of the present embodiment, the bolt fastening portions 72a to 72c protrude outward from the holder annular portion 70 in the radial direction. For this reason, even if the surface 90 (hereinafter referred to as “mounting surface 90”) to which the resolver holder 56 is attached in the engine block 32 has irregularities, the bolt fastening portions 72a to 72c are formed or arranged avoiding the irregularities. Thus, the resolver holder 56 can be attached to the engine block 32.

Therefore, as shown in FIG. 6, the resolver holder 56 can be arranged avoiding the convex portion 34 existing on the mounting surface 90 of the engine block 32. That is, in FIG. 6, the length D1 from the axis Ax of the output shaft portion 44 to the tip of the fastening portion 72b is longer than the length D2 from the axis Ax to the convex portion 34, but in the direction of the arrow X2 in FIG. When viewed, the phases of the fastening portions 72a to 72c and the convex portion 34 of the engine block 32 are different. In other words, when viewed in the direction of the arrow X2, the convex portion 34 does not exist on the half line from the axis Ax to the tips of the fastening portions 72a to 72c. For this reason, it is possible to arrange the resolver holder 56 (and the resolver stator 54) while avoiding buffering with respect to the engine block 32.

Similarly, as shown in FIG. 7, the resolver holder 56 can be arranged avoiding the hole 92 (a kind of recess) present in the mounting surface 90 of the engine block 32. That is, in FIG. 7, since the hole 92 exists, the fastening portions 72a to 72c cannot be provided at positions corresponding to the hole 92 in the resolver holder 56, but the fastening portion 72a is avoided so as to avoid the hole 92. 72c can be formed. For this reason, it is possible to arrange the resolver holder 56 (and the resolver stator 54) while avoiding buffering with respect to the engine block 32.

Similarly, as shown in FIG. 8, the resolver holder 56 can be arranged avoiding the concave portion 94 present on the mounting surface 90 of the engine block 32. That is, in FIG. 8, since the concave portion 94 exists, it is difficult to fasten the fastening portions 72 a to 72 c at the position corresponding to the concave portion 94 in the resolver holder 56, but the fastening portions 72 a to 72 c are formed so as to avoid the concave portion 94. Can do. Therefore, it is easy to secure the positions of the fastening portions 72a to 72c with respect to the engine block 32.

4). Comparison with Comparative Example FIG. 9 is a diagram illustrating a positional relationship between the motor 118 and the resolver 120 of the motor unit 116 according to the comparative example. The motor 118 according to the comparative example has the same configuration as the motor 18 in the present embodiment. In the resolver 120 according to the comparative example, the resolver holder 156 has a shape shown in FIG. 9 in order to avoid the convex portion 34, the hole portion 92, and the concave portion 94 in the engine 14. Unlike the present embodiment, in the resolver holder 156 of the comparative example, the holder fastening portions 172a to 172d have different magnetic resistances Rm with respect to the leakage magnetic flux Φ in each phase.

FIG. 10 is a diagram for explaining an example of the leakage flux Φ from the

motors

18 and 118 to the

resolvers

20 and 120 in the present embodiment and the comparative example. In FIG. 10, the horizontal axis represents the rotational frequency of the motors 18 and 118 (hereinafter referred to as “motor frequency f”) [Hz], and the vertical axis represents the leakage magnetic flux Φ [Wb] entering the

resolvers

20 and 120. . In FIG. 10, the leakage flux Φ1 relates to the present embodiment, and the leakage flux Φ2 relates to a comparative example.

In FIG. 10, when the motor frequency f is f1, both the leakage flux Φ1 of the present embodiment and the leakage flux Φ2 of the comparative example are relatively large, but this embodiment is compared with the leakage flux Φ2 of the comparative example. The leakage magnetic flux Φ1 of the form is about half and greatly reduced.

5. As described above, according to the present embodiment, the shape of the resolver holder 56 is set so that the magnetic resistance Rm with respect to the leakage flux Φ of each phase from the motor stator 42 (and the motor rotor 40) is equal. Constitute. As a result, the leakage magnetic flux Φ from each phase cancels out, so that the influence of the leakage magnetic flux Φ from the motor 18 to the resolver 20 can be suppressed, and the accuracy of the resolver 20 can be improved. Further, since the leakage flux Φ from each phase is canceled out, the influence of the leakage flux Φ can be suppressed even when the leakage flux Φ from each phase is relatively strong. Therefore, the distance between the motor 18 and the resolver 20 can be made relatively short, and space can be saved.

In the present embodiment, the resolver holder 56 includes an annular portion 70 to which the resolver stator 54 is attached, and a plurality of fastening portions 72a to 72c (protruding portions) that protrude radially outward from the annular portion 70, with respect to the engine block 32. These are attached via a plurality of fastening portions 72a to 72c. The number of the plurality of fastening portions 72a to 72c is “3”, which is the same as the number of phases of the motor 18. The fastening portions 72a to 72c have the same shape, and the three fastening portions 72a to 72c And W-phase motor coils 80, U-phase and V-phase motor coils 80, and V-phase and W-phase motor coils 80. In other words, the same number of fastening portions 72a to 72c are distributed in each phase of the motor 18, and the arrangement of the fastening portions 72a to 72c in each phase is made equal. As a result, it is possible to design a configuration in which the magnetic resistance Rm with respect to the leakage magnetic flux Φ of each phase is uniform relatively easily.

In the present embodiment, the mounting surface 90 of the engine block 32 is formed with a convex portion 34, a hole portion 92 (a kind of concave portion) and a concave portion 94, and the fastening portions 72a to 72c are provided with the convex portion 34, the hole portion 92 and the concave portion. It is attached to the attachment surface 90 at a position other than 94. Thereby, even if the convex part 34, the hole part 92, and the recessed part 94 exist in the attachment surface 90, it becomes possible to arrange | position the resolver holder 56 avoiding the convex part 34, the hole part 92, and the recessed part 94. Therefore, it becomes easy to avoid an increase in size due to the presence of the resolver holder 56.

B. Modifications It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the contents described in this specification. For example, the following configuration can be adopted.

1. Applicable object In the above-described embodiment, the motor unit 16 is mounted on the electric vehicle 10 that is a hybrid vehicle. However, the present invention is not limited to this and can be applied to any application that uses the motor 18 and the resolver 20. For example, in the above embodiment, the motor 18 is used for driving the vehicle 10, but may be used for other applications in the vehicle 10 (for example, an electric power steering, an air conditioner, an air compressor, etc.). Alternatively, it may be applied to another electric vehicle 10 using the motor unit 16 (for example, an electric vehicle or a fuel cell vehicle using only the motor 18 as a drive source). Or the motor unit 16 can also be used for apparatuses, such as an industrial machine and household appliances.

2. Motor 18
In the above-described embodiment, the number of motor coils 80 of the motor stator 42 is 24 (see FIG. 4). For example, the number of motor coils 80 may be 21 or 27. The motor coils 80 are preferably equally spaced when viewed in the axial direction (for example, when viewed in the direction of the arrow X1 or X2 in FIG. 1). Moreover, if the motor 18 is an alternating current system, it will not be restricted to a 3 phase alternating current system. In the above embodiment, the motor 18 is a brushless type, but may be a brush type. In the above embodiment, the current from the battery (battery current) is flowed to the motor stator 42 side, but the battery current may be flowed to the motor rotor 40 side. In the above-described embodiment, the motor stator 42 is disposed on the radially outer side of the motor rotor 40 (see FIG. 1). However, the motor stator 42 may be disposed on the radially inner side of the motor rotor 40.

3. Resolver 20
In the above embodiment, the motor coil of the motor stator 42 is disposed between the first fastening portion 72a and the second fastening portion 72b and between the second fastening portion 72b and the third fastening portion 72c in the direction of the axis Ax. Each fastening portion 72 is arranged so that there are four 80s (see FIG. 4). However, the arrangement of the fastening portions 72a to 72c is not limited to this as long as the magnetic resistance Rm with respect to the leakage flux Φ of each phase is equal.

For example, as in the second resolver holder 56a of the resolver 20a constituting the motor unit 16a according to the first modification shown in FIG. 11 (hereinafter also referred to as “resolver holder 56a”), the direction of the axis Ax (in FIG. In the direction of the arrow X1 or X2), between the first fastening portion 72a and the second fastening portion 72b, between the second fastening portion 72b and the third fastening portion 72c, and between the first fastening portion 72a and the third fastening portion 72b. The fastening portions 72a to 72c may be arranged between the fastening portions 72c so that there are eight motor coils 80 of the motor stator 42, respectively. In other words, the fastening portions 72a to 72c may be formed so that the intervals between the adjacent fastening portions 72a to 72c are equal.

Or in the resolver holder 56 which concerns on the said embodiment, and the resolver holder 56a which concerns on the said 1st modification, the angle between the 1st fastening part 72a and the 2nd fastening part 72b, and the 2nd fastening part 72b and 3rd The angles between the fastening portions 72c of the two are equal, but the angles may be varied as long as the magnetic resistance Rm with respect to the leakage flux Φ of each phase is equal. For example, the number of motor coils 80 between the first fastening portion 72a and the second fastening portion 72b in the direction of the axis Ax is 4, whereas the second fastening portion 72b and the third fastening portion 72c The number of motor coils 80 in between may be set to 7, 10, 13, 16, or 19.

In the resolver holder 56 according to the embodiment and the resolver holder 56a according to the first modification, the fastening portions 72a to 72c are arranged so as to come to the boundaries of the motor coils 80 when viewed in the direction of the axis Ax. As long as the magnetic resistance Rm with respect to the leakage flux Φ of each phase is equal (see FIG. 4), the positions of the fastening portions 72a to 72c with respect to the motor coil 80 are not limited to this. For example, the fastening portions 72a to 72c are positioned at the center of each motor coil 80 (for example, the positional relationship between the fastening portion 172c of the resolver holder 156 and the motor coil 80 according to the comparative example of FIG. ) You may arrange.

In the above embodiment, the number of bolt fastening portions 72a to 72c is set to 3, which is the same as the number of phases of the motor 18, but two or four if the magnetic resistance Rm with respect to the leakage magnetic flux Φ of each phase is equal. There may be more than one. However, it is more likely that design or positioning is easier when the number of phases is a multiple (for example, 3, 6, 9, etc.).

In the above embodiment and the first modification, the three bolt fastening portions 72a to 72c have the same shape. However, as long as the magnetic resistance Rm with respect to the leakage magnetic flux Φ of each phase of the motor 18 is equal, the shapes are different. There may be.

For example, in the direction of the axis Ax (in the direction of the arrow X1 or X2 in FIG. 1) like the second resolver holder 56b of the resolver 20b constituting the motor unit 16b according to the second modification shown in FIG. Two bolt fastening portions 72a to 72d (protruding portions) having the same shape are arranged between the W phase and the U-W phase, respectively, but only one bolt fastening portion 72e (protruding portion) is provided between the U and V phases. Be placed. By making the bolt fastening portion 72e larger than the bolt fastening portions 72a to 72d (here, twice as large) and changing the shape, the magnetic resistance Rm with respect to the leakage flux Φ of each phase can be made equal. .

In the above embodiment, the protrusions formed on the resolver holder 56 are all bolt fastening parts 72a to 72c. However, in order to make the magnetic resistance Rm with respect to the leakage flux Φ of each phase uniform, a protrusion that is not a bolt fastening part is provided. You can also.

In the above embodiment, the resolver holder 56 is attached to the engine block 32, but the object to which the resolver holder 56 is attached is not limited to this. For example, a part such as a case of the motor 18 or a mission block may be used.

In the above embodiment, the resolver holder 56 is attached to the engine block 32 with the bolt 78, but the attaching means or attaching method of the resolver holder 56 is not limited to this. For example, you may use attachment methods, such as welding and adhesion | attachment by an adhesive agent.

In the above embodiment, the description has been given with particular attention to the leakage magnetic flux Φ from the motor stator 42, but the shape of the resolver holder 56 is a magnetic field for the leakage magnetic flux Φ of each phase from at least one of the motor stator 42 and the motor rotor 40. If resistance Rm becomes equal, it will not restrict to this.

In the above embodiment, the second resolver holder 56 for the resolver stator 54 has been described with particular attention to the configuration and arrangement. However, a similar configuration (a configuration in which the magnetic resistance Rm with respect to the leakage flux Φ of each phase is equal) The first resolver holder 52 for the resolver rotor 50 may be used.

Claims

A resolver holder (52, 56, 56a, 56b) for holding a resolver stator (54) or a resolver rotor (50) of a resolver (20, 20a, 20b) for detecting a rotation angle of a motor (18),
The resolver holder (52, 56, 56a, 56b) is configured such that the magnetic resistance against the leakage magnetic flux of each phase from at least one of the motor stator (42) and the motor rotor (40) is equal. Resolver holder (52, 56, 56a, 56b).
Resolver holder (52, 56, 56a, 56b) according to claim 1,
The resolver holder (52, 56, 56a, 56b)
An annular portion (70) to which the resolver stator (54) or the resolver rotor (50) is attached;
A plurality of projecting portions (72a to 72e) projecting radially outward or radially inward from the annular portion (70),
Resolver holders (52, 52, 72a to 72e) are attached to the external attachment part (32) for attaching the resolver holders (52, 56, 56a, 56b) through the plurality of protrusions (72a to 72e). 56, 56a, 56b).
Resolver holder (52, 56, 56a, 56b) according to claim 2,
The number of the plurality of protrusions (72a to 72e) is the same as or a multiple of the number of phases of the motor (18),
Each of the plurality of protrusions (72a to 72e) has the same shape or a different shape,
The resolver holder (52) is characterized in that the plurality of protrusions (72a to 72e) are distributed in the same number in each phase of the motor (18), and the arrangement of the protrusions (72a to 72e) in each phase is equal. 56, 56a, 56b).
Resolver holder (52, 56, 56a, 56b) according to claim 2 or 3,
A motor unit (16, 16a, 16b) comprising the external mounting portion (32),
At least one of a convex part (34) and a concave part (92, 94) is formed on the attachment surface (90) to which the protruding parts (72a to 72e) are attached among the external attachment part (32), The protrusions (72a to 72e) are attached to the attachment surface (90) at positions other than the protrusions (34) and the recesses (92, 94). The motor unit (16, 16a, 16b) .
A motor (18);
A motor unit (16, 16a, 16b) comprising a resolver (20, 20a, 20b) for detecting a rotation angle of the motor (18),
The resolver (20, 20a, 20b) includes a resolver holder (52, 56, 56a, 56b) for holding a resolver stator (54) or a resolver rotor (50),
The resolver holder (52, 56, 56a, 56b) is arranged so that the magnetic resistance against the leakage magnetic flux from each phase in at least one of the motor stator (42) and the motor rotor (40) of the motor (18) is uniform. A motor unit (16, 16a, 16b) characterized by that.
A motor (18) and a resolver (20, 20a, 20b) for detecting a rotation angle of the motor (18) are provided, and the resolver (20, 20a, 20b) is a resolver stator (54) or a resolver rotor (50). A motor unit (16, 16a, 16b) having a resolver holder (52, 56, 56a, 56b) for holding
The resolver holder (52, 56, 56a, 56b) includes an annular portion (70) to which the resolver stator (54) or the resolver rotor (50) is attached, and a plurality of radially protruding outer portions from the annular portion (70). Projecting portions (72a to 72e),
The resolver holders (52, 56, 52) are arranged so that the magnetic resistance against the leakage magnetic flux of each phase from at least one of the motor stator (42) and the motor rotor (40) to the resolver holders (52, 56, 56a, 56b) becomes equal. 56a, 56b) is disposed. A method for manufacturing a motor unit (16, 16a, 16b).